FNB Missing funds and no assistance from the bank

I am extremely disappointed with the handling of an issue involving my temporary loan and missing funds. On 13 March, I took out a temporary loan and later transferred R1,600 to my savings account. When I attempted to move a small portion back to my primary account, the money was immediately taken, supposedly to repay the loan. I tried to transfer funds several more times and ended up with insufficient funds each time. I was eventually only able to withdraw R350. At the branch, I was told that the full R1,600 had been allocated toward the loan — yet nothing reflects on the loan account. When I contacted the call centre, I received a completely different explanation. I was told that only R600 was deducted toward the loan and that this amount was reversed. While the reversal shows, the remaining R1,000 is unaccounted for. It does not reflect as a loan payment, nor is it available in my account. To make matters worse, the loan account currently shows zero payments made, and my online assistance request was closed without any explanation or resolution. This situation has caused major inconvenience, and despite multiple attempts to get clarity, I still have no answers, no corrected account information, and no explanation for the missing R1,000. I am requesting an urgent investigation and a proper explanation as to:

What happened to the missing R1,000 Why the loan account shows no payments Why my ticket was closed without resolution

This level of service is unacceptable.